Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2005-09-08
2008-08-05
Douglas, Steven O (Department: 3771)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S201270, C128S200290
Reexamination Certificate
active
07406964
ABSTRACT:
An improved underwater breathing apparatus includes a gas- and liquid-tight helmet, with an attached air valve, tank coupling and tank bracket. The helmet further includes a flange generally conforming to the shoulders of a user, and incorporates ballast material. The air valve is attached to the helmet with the tank coupling and the tank bracket is attached to the tank coupling. When worn, the tank bracket is oriented substantially parallel to, and a finite distance away from, the user, whereby only the flange contacts the user. In other embodiments the helmet further includes an optically transparent face shield, or the entire helmet is may be manufactured from an optically transparent material. A handle may be attached to the helmet to aid in lifting and storage. The air valve may include an air flow regulator, a compressed air supply coupling or an air flow gauge.
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patent: 3880157 (1975-04-01), Elifritz
patent: 5079775 (1992-01-01), Kaburaki
patent: 5620282 (1997-04-01), Stinton
patent: 5887836 (1999-03-01), Back
patent: 5906200 (1999-05-01), Kaburaki
patent: 6293733 (2001-09-01), Tezuka
Barlow Timothy M.
Douglas Steven O
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